I had never been on a real roller coaster. Fear of speed, fear of heights: They just weren't for me. The closest I had ever got was a kiddie-coaster when I was six. It was probably six feet tall, but I had it stopped even before we got up to the first slope. So today I just waited for my friends while they took the 53 mph roller-coaster-riding. As they stepped off the ride, they all tried to persuade (说服 ) me to follow them onto the next one. "Come on, Lisi!" Jennifer said, "You're so boring! Just come with us!" "It's not that scary," added Jackie, "I'll sit next to you." "Look: This is the slowest ride in the park!" Christina pointed out. Finally, I gave in and agreed to get on the roller coaster, although I still wasn't sure. Of course everyone had come out alive so far, but you never know what will happen. As we stood in line, I got more scared. "It looks really big from down here," I worried out loud.Finally, we reached the front of the line. I sat in a .